从有机丰富和富含铁的沉浸土壤中释放和挥发反
J N Caplette1, S C Wilson2, A Mestrot3
1Institute of Geography, University of Bern, Switzerland; Minnow Aquatic Environmental Services, Toronto, Canada.
Journal of hazardous materials
|April 12, 2024
概括
浸水严重影响土壤中的反 (Sb) 行为. 在有机丰富的土壤和富含铁的土壤中发生了反释放和挥发,这表明潜在的广泛环境过程.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 土壤科学 土壤科学
背景情况:
- (Sb) 是一种新兴的土壤污染物,其在浸水条件下的行为不太清楚.
- 容易淹水的土壤,如湿地和洪水平原土壤,对Sb命运研究特别感兴趣.
研究的目的:
- 为了研究浸水对抗氧释放,甲基化和挥发的影响.
- 为了比较有机丰富的湿地土壤中的Sb行为与富含铁 (Fe) 的洪水平原土壤.
主要方法:
- 用两种不同的土壤类型进行了为期27天的微观宇宙实验:有机丰富的湿地土壤和富含铁的洪水平原土壤.
- 在微观宇宙中应用了浸水,以模拟环境条件.
- 测量了孔水和挥发性Sb中的抗度.
主要成果:
- 浸水立即增加了有机丰富的土壤中孔水中的Sb释放 (3.23.5毫克L-1),与硫化物沉和与有机物质和 (Mn) (oxyhydr) oxides.sorption相关.
- 在富含铁的土壤中Sb的释放与Fe- ((oxyhydr) oxide的减少有关,通过与Fe-硫化物或作为Sb-硫化物共同沉来固定.
- 在灌水后,从这两种土壤中都产生了挥发性Sb;有机丰富的土壤产生了更多 (409835 ng kg-1),但富含铁的土壤更有效地挥发了Sb.
- 抗挥发与测量土壤参数的关联是微不足道的,这表明复杂的,潜在的微生物驱动因素.
结论:
- 浸水严重影响土壤中的的流动性和转化.
- 抗挥发可能是土壤中无处不在的过程,可能是由微生物活动驱动的,无论土壤的特定特性如何.
- 需要进一步的研究来阐明控制土壤环境中的抗氧化物挥发的微生物和生化机制,以及它在生物地化学循环中的作用.
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